A Java package designed to allow basic matrix manipulation and visualization in MATLAB-like programing. Derived from the JAMA package (by the NIST and MathWorks Inc.), Jamato includes manipulation and visualization tools in addition to JAMA numeric algorithms. Jamato also includes a modified version of MathEvaluator class (by The-Son LAI) allowing users to parse natrix and numeric expressions. Downloadable on the GNU Public License.